# -*- coding: utf-8 -*-


if __name__ == '__main__':
    """
    None 或 '',判断时均为false
    
    """
    book_name = None
    # print(book_name)
    if book_name:
        print('非空。。。')
    else:
        print('book-name为空值')

    title = ''
    if title:
        print('title非空。。。')
    else:
        print('title为空。。。')


    # str1 = ['作者:[美]', '埃里克·马瑟斯', '（', 'Eric', ' ', 'Matthes', '）']
    # str2 = ' '.join(str1)
    # print(str2)
